Experimental study on the characteristics of fly ash colloid containing XG/HPMC to inhibit coal spontaneous combustion
WANG Hui
SU Xiaojun
LIU Xixi
WANG Jian
ZHANG Jiamin
Abstract：Fly ash grouting is a common method for mine fire prevention and control.Aiming at the problems of fly ash slurry which is prone to water-loss cracking,poor stability and low fire prevention efficiency,fly ash colloids were prepared by adding high mo-lecular polymer xanthan gum(XG)and hydroxypropyl methyl cellulose(HPMC)to fly ash slurry,and the gel formation time,water-retaining property and thermal stability of fly ash colloids with different water-cement ratios were tested.The effect of colloid on the inhibition of coal spontaneous combustion was studied by programmed temperature.The results showed that when the water-cement ratio of fly ash slurry was 10∶1,the glue formation time was 9.52 min,and the water-retaining property and static stability were good.The fly ash colloid exhibited the shear dilution phenomenon of non-Newtonian fluid,and the energy storage modulus G′ was higher than the loss modulus G″.It was a pseudo-plastic fluid conforming to the power law model,and exhibited the properties of elastic solid.The weight loss process of fly ash colloidal heating can be divided into three stages(30-100℃,218-380℃and 380-800℃),and the total mass loss was about 6.17%.Fly ash colloid had the function of high moisture content,oxygen isolation and fis-sure sealing.The inhibition rate of coal sample after inhibition was 75.86%,and the corresponding temperature point of CO and C2H4 gas generation were 30℃and 20℃later than that of raw coal.The spontaneous combustion process of coal had been effectively inhibited.
Keywords：fly ashcoal spontaneous combustiongelling propertyrheological propertiesstabilityxanthan gum
Publication Date：2024-09-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 100-109 )